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No. 338,934. PatentedrMar. 30, 1886.

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HENRY DAVEY, OE LEEDS, COUNTY OF YORK, ENGLAND.

LOW/PRESSURE STEAM-MOTOR.

SFECIPICATION forming part of Letters Patent No.338,93&, dated March30,1886.

Application filed August 20, 1885. Serial Xo.174,856. (No model.)Patented in France May 31, 1S84,No.162,501; in Germany June 17, 18s-1,No. 30,101; in Belgium Juno 23, 18S-l, No. 65,559, and in EnglandNovember 16.1BS4, No. 15,15.

To all whom it may concern:

Be it known that I, HENRY DAvEY, a citizen of England, residing atLeeds, county of York, England, have invented a new and usefulImprovement in Low-Pressure Steam-Motors, of which the following isaspecication.

My invention relates to the device for feeding the water into the boilerof a low-pressure steam-engine, which is worked at a pressure rarelyexceeding that of the atmosphere, so that no feeding against pressure isrequired; and my invention consists in the features of constructionhereinafter described.

In the drawings, A represents the section of the boiler of alow-pressure steam-engine; B, the cylinder; O, a section of thecondensertank; E, a pipe leading from near the top of the condenser-tankto the lower part of a steam-boiler; F, a box or gage communicating withthe steam-boiler, and covered with glass to permit the amount of waterin the boiler from time to time to be ascertained; G, a float within thebox or portion of the boiler covered with glass, which rises and fallswith the water, H, a hole at the bottom of such box, through which thewater passes into the boiler as used; I, a plate, shield, or piece ofmetal within such box, placedimmediately in front of a holecommunicating between the boiler and the box or water-gage near its top,and through which steam from the steam-space in the boiler may freelyenter-'the box or gage, and J, such hole.

In constructing my improved low-pressure steam-motor I take the motordescribed and shown in the English Letters Patent to me, No. 15,185, ofNovember 18, 1884,which shows all the substantial features of myinvention. At the side of the boiler, which I preferably make upright,as shown,witl1 the fire-box and iiue located within the same, I locate asteamcondensing tank. (Harked C in the drawings.) This condenser is tobe provided with pipes, placed in avertical or other suitable position,through which exhaust-steam from the boiler passes and circulates. Coldwater is introduced into the condenser-tank, so that it may surround thesteam-condenser pipes. These pipes, being heated by the passage of theexhaust-steam through them,heat the waterin the condensing-tank. As theexhaust-steam enters the condensing-tank near its top, it willnecessarily be of a much higher temperature at that point than afterhaving passed down and through the condensing-pipes to the bottom u ofthe tank, where it is permitted to escape. This higher temperature ofthe condensingpipes near the top of the condensing-tank, together withthe fact that as the particles of wat-er become heated they naturallyrise to the top, causes the water in the top of the condensing-tank tobe heated to a very much higher degree than the water in the middle ornear the bottom of such tank. To avail myself of these facts theinflow-pipe leading from the condensing-tank to the boilei` is attachedto such tank near its top, and the water to replenish the boiler drawnfrom that point. I carry the pipe down as far as desired, and suiiicientto cause the water to iow by gravity, and insert the lower end of itinto a box, re ceptacle, or gage bolted to the side of the boiler andcommunicating therewith,and covered with a strong glass front, so thatby a mere glance the amount of water in the boiler can always beascertained. The hole H through the shell ofthe boiler forms the meansof communication between the boiler and the gage, so that the water canflow into the boiler as needed. Another hole through the shell of theboiler communicates with the gage near its top, to permit the steam tofreely pass out of the boiler and into the gage above the water, toexert such pressure as it may be able to do, and thus facilitate theinflow of the water into the boiler. A float is placed in this gage,that rises and falls with the water. On the lower end of this iloat G isplaced a piece, K, that is located under the inflow-pipe and under theorice in such pipe, by which the water is admitted into the gage. Thisdoat G and valve K are arranged so that when the water flowing into thegage F rises to a certain height, so that the float is raised up,carrying with it the valve, the valve rests against the orifice throughwhich the water Hows, and cuts off the supply until the water has becomesuiiiciently exhausted in the boiler to cause the oat to descend again,carrying the valve down with it, and thus automatically permit IOCanother ini-low of Water. In this Way the amount of Water supplied tothe boiler is constantly and automatically provided for.

Iam not aware of any upright condensingtank used in connection with alow-pressure steam-engine, nor any arrangement for feeding the Waterfrom the top of au upright condensing-chamber, as described above, priorto the patenting of the same to me in the English Letters Patent abovementioned, and I find this arrangement to possess some very decidedadvantages over any other kind that I have ever seen or used.

In this application I do not wish to claim anything which is alreadyclaimed in my application filed December 18, 1844, Serial No. 150,610,but confine myself to the particular subject-matter claimed in thisapplication.

HENRY DAVEY.

Vitnesses:

JOHN LOWE, EDWD. WHITELEY,

Solicitors Clerks, Leeds.

